JP2009195767A - Cleaning mechanism of coater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To remove surely a coating adhering to the inside of a bell head or a rotating body rotating by an air motor. <P>SOLUTION: A housing 5 is connected to a double-pipe type feed tube 2 supplying air and thinner to the bell head 4 fixed to the hollow rotating body rotation-driven by the air motor, and has in the back-end surface 5a an air supply port 7 supplying only air to a hollow 51 of the housing and an air-thinner supply port 8 supplying alternately air and thinner to the hollow, which are arranged at the position offset from the circle center of the hollow. A funnel part 52 formed conically so as to be tapered toward a space 22 of the feed tube is provided on the fixed side of the hollow feed tube. An outer casing 23 of the feed tube has, on the tip opening 23a, four radially-inclined grooves 24 notched at an angle in an outer circumferential direction from the inner circumferential surface 23b toward the tip, and the tip 23d is arranged at the position in which air and thinner discharged along the inclined grooves are introduced into the inner circumferential surface 41 of the bell head along the inner circumferential surface 31 of the rotating body. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a painting machine for painting a car body of an automobile, and more particularly to a washing mechanism of a painting machine for washing a rotating body or bell head rotated by an air motor.

  Conventionally, a coating machine 100 as shown in FIG. 3 (A) has been used to paint the body of an automobile. The coating machine 100 is used for a painting robot, and paint is supplied from a paint filling apparatus 200 via a paint supply pipe 300, and cleaning air and thinner are supplied via the cleaning supply pipe 400. 200 is supplied. The paint supply pipe 300 and the cleaning supply pipe 400 are disposed on a moving arm that moves the coating machine 100 to a desired position along the shape of the vehicle body.

  Such a coating machine 100 is fitted so as to cover a double-tube feed tube 110 composed of an inner cylinder 111 and an outer cylinder 112, and a tip end region 110A of the feed tube 110, and an air motor (not shown). .) Is fixed to the hollow rotating body 120 rotating around the tip end region 110A and the tip end portion 120a of the rotating body 120, and is discharged from the tip 111a of the inner cylinder 111 by the centrifugal force generated by the rotation of the rotating body 120. A hollow bell head 130 for spraying the applied paint and a cavity 141 that is fixed to the rear end portion 110a of the feed tube 110, penetrates the inner cylinder 111, and supplies air and thinner to the space 113 in the feed tube 110. (See, for example, Patent Document 1).

  In the feed tube 110, the inner cylinder 111 is formed to have the same diameter in the longitudinal direction, while the outer cylinder 112 is formed to have a small diameter in the tip region 110A, and the inner diameter of the outer tube 112 is the same as that of the tip region 110A. It is formed large along the outer diameter up to this side. In addition, the bell head 130 is formed with a hub 131 for diffusing the paint slightly inward from the tip. The housing 140 communicates with the inner cylinder 111 at the rear end surface 140a and is connected to the paint supply pipe 300, and is connected to the cavity 141 and is connected to the cleaning supply pipe 400 with air. A thinner supply port 160 is provided.

  As shown in FIG. 3B, the coating machine 100 configured as described above has a predetermined coating material in the inner cylinder 111 of the feed tube 110 from the coating material filling apparatus 200 through the coating material supply pipe 300 during coating. The paint is discharged from the tip of the inner cylinder 111 into the inner space 132 of the bell head 130 at a predetermined pressure. The bell head 130 in which the paint is discharged into the inner space 132 at a predetermined pressure is rotated at a high speed by an air motor through the rotating body 120, so that the paint is atomized by being blown from the hub 131 by centrifugal force. It is jetted forward in the state.

  Further, when cleaning, as shown in FIG. 3C, in the space 113 formed between the inner cylinder 111 and the outer cylinder 112 of the feed tube 110 from the paint filling device 200 through the cleaning supply pipe 400. Air and thinner are supplied at a predetermined pressure, and air and thinner are discharged from the tip of the outer cylinder 112 into the inner space 132 of the bell head 130 at a predetermined pressure. The bell head 130 in which air and thinner are discharged into the inner space 132 at a predetermined pressure is rotated at a high speed by an air motor through the rotating body 120, so that the air and thinner are moved to the inner space 132 and the hub 131 by centrifugal force. Since it is blown, the paint adhering to the inner space 132 and the hub 131 of the bell head 130 can be removed.

JP 2007-7533 A

  However, in the coating machine 100 described above, the paint remaining in the bell head 130 must be removed by washing in order to change the painting color of the vehicle body flowing through the production line. Since the air and the thinner must be alternately supplied to the change valve 500 at 400, the paint adhering to the bell head 130 together with the thinner when the thinner is supplied becomes thinner at the hub 131 of the bell head 130 by the discharge pressure of the thinner. Due to the reflection, the rotating body 120 and the outer tube 112 of the feed tube 110 may flow backward, and thinner or paint may remain attached thereto. Further, if the paint flows backward between the rotating body 120 and the outer cylinder 112, a fiber type sensor (not shown) for rotation detection installed in the air motor mounting portion is soiled and the detection capability is lowered. .

  Furthermore, in order to clean the coating machine 100, the coating machine 100 is directed with the bell head 130 facing downward. In this case, since the cavity 141 of the housing 140 is cylindrical, the corner is a thinner portion serving as the lower surface of the cavity 141. The paint thinner sometimes dropped on the painted surface during painting.

  The present invention has been made to solve such a conventional problem, and provides a coating machine cleaning mechanism capable of reliably removing paint adhering to a rotating body or a bell head rotated by an air motor. The purpose is to do. Furthermore, an object of the present invention is to provide a cleaning mechanism for a coating machine that can prevent the thinner from remaining in a housing that supplies paint, air, and thinner to the feed tube. Another object of the present invention is to provide a coating machine cleaning mechanism that can reduce the amount of thinner used and the cleaning time.

  A cleaning mechanism for a coating machine according to the present invention that achieves the above-described object is provided with a double-tube feed tube including an inner cylinder to which paint is supplied and an outer cylinder that is inserted so that the inner cylinder has a space. And a hollow rotating body that is fitted so as to cover the tip end region of the feed tube and is rotated by the air motor around the tip end region, and a centrifugal force that is fixed to the tip end of the rotating body and that is caused by the rotation of the rotating body. A bell head for spraying the paint discharged from the tip of the inner cylinder by the cylinder, and a cylindrical shape that is fixed to the rear end of the outer cylinder, penetrates the inner cylinder, and supplies air and thinner to the space in the feed tube A cleaning mechanism for cleaning the rotating body of the cleaning machine and the inside of the bell head with air and thinner with a housing having a flat portion positioned in the axial direction of the inner cylinder, In the rear end face, an air supply port for supplying only air into the cavity and an air thinner supply port for alternately supplying air and thinner into the cavity are arranged at a position offset from the circular center of the cavity, On the fixed side of the hollow feed tube, there is provided a funnel portion formed in a conical shape so as to taper toward the space, and the outer cylinder is provided in the outer peripheral direction from the inner peripheral surface to the front end at the front end opening. At least one inclined groove cut obliquely is provided radially, and the tip is located at a position where air and thinner discharged along the inclined groove are guided to the inner peripheral surface of the bell head along the inner peripheral surface of the rotating body. It is what is arranged.

  According to the cleaning mechanism of the coating machine according to the first aspect as described above, the housing is arranged at a position where the air supply port and the air thinner supply port are offset from the circular center of the cavity on the rear end surface. Since air can always be supplied from the air supply port during cleaning, air can be supplied at the same time as the thinner is supplied from the air thinner supply port, and the housing is a hollow feed tube. Since the fixed side of the tube has a funnel portion that tapers toward the space formed between the inner tube and the outer tube of the feed tube, the funnel portion is inclined by supplying air and thinner into the cavity. Since vortexes are generated along the surface, air and thinner supplied at the same time are spirally swirled in the space of the feed tube while being stirred. In this way, the air and thinner supplied at the same time are spirally swirled in the space of the feed tube in a state where the air and thinner are agitated, so that the inner peripheral surface of the bell head is moved together with the inner peripheral surface of the rotating body from the inclined groove of the outer cylinder. Bubbling cleaning with air and thinner can be performed. Moreover, since air is always discharged from the inclined groove of the outer cylinder to the inner peripheral surface of the bell head together with the inner peripheral surface of the rotating body, an air curtain can be built there.

  The second aspect of the present invention is the coating machine cleaning mechanism according to the first aspect, wherein the space formed between the inner cylinder and the outer cylinder of the feed tube includes air supplied from an air supply port via a cavity. The air thinner and the thinner are alternately supplied from the air thinner supply port through a cavity so as to increase the flow velocity.

  According to the cleaning mechanism of the coating machine according to the second aspect, since the discharge pressure of air and thinner by bubbling cleaning can be increased, cleaning performance can be improved.

  The third aspect of the present invention is the coating machine cleaning mechanism according to the first aspect, wherein the axis of the feed tube has an air supply port and an air thinner supply centered on the apex of the cone forming the hollow funnel portion. The offset position of the mouth is offset from the feed tube by an amount corresponding to the diameter of the feed tube.

  According to the cleaning mechanism of the coating machine according to the third aspect as described above, the spirally swirling air and thinner can be efficiently and smoothly guided into the space of the feed tube along the inclination of the funnel portion. .

  According to the cleaning mechanism of the coating machine of the present invention, the paint adhering to the rotating body or the bell head rotated by the air motor can be reliably removed. Furthermore, it is possible to prevent the thinner from remaining in the housing that supplies the feed tube with paint, air, and thinner. Further, the amount of thinner used and the cleaning time can be shortened.

  The best mode for carrying out the cleaning mechanism for a coating machine according to the present invention will be described below with reference to the drawings.

  As shown in FIG. 1A, a cleaning machine to which the cleaning mechanism of the present invention is applied includes an inner cylinder 21 to which paint is supplied and an outer cylinder 23 inserted so that the inner cylinder 21 has a space 22. The feed tube 2 that is formed, a hollow rotating body 3 that is fitted so as to cover the tip end region 2A of the feed tube 2 and rotates around the tip end region 2A by an air motor (not shown), and rotation A bell head 4 that is fixed to the tip 3a of the body 3 and sprays the paint discharged from the tip 21a of the inner cylinder 21 by the centrifugal force generated by the rotation of the rotating body 3, and a rear end 23c of the outer cylinder 23 of the feed tube 2. A cylindrical cavity 51 for supplying air and thinner to the space 22 in the feed tube 2 is formed, and the cavity 51 is flat in the axial direction of the inner cylinder 21. There has been a housing 5 positioned.

  The feed tube 2 is a double-pipe structure composed of an inner cylinder 21 and an outer cylinder 23 whose axial centers are concentrically positioned. As shown in FIGS. 1 (A) and 1 (B), the space 22 crosses the space 22. The surface shape is formed in a ring shape. The outer cylinder 23 is provided with four inclined grooves 24 radially formed at equal angular intervals in the distal end opening 23a, which are notched obliquely in the direction of the outer periphery 23e from the inner peripheral surface 23b toward the distal end 23d. The number of the inclined grooves 24 is not limited to this and is determined based on the cleaning effect. The tip 23 d of the outer cylinder 23 is disposed at a position where air and thinner discharged along the inclined groove 24 are guided to the inner peripheral surface 41 of the bell head 4 along the inner peripheral surface 31 of the rotating body 3. The tip 21 a of the inner cylinder 21 enters the bell head 4 from the tip 23 d of the outer cylinder 23.

  The air motor that drives the rotating body 3 is connected to an air pipe (not shown) disposed on a moving arm (not shown) that moves the coating machine 1 to a desired position along the vehicle body shape. The rotating body 3 can be driven to rotate at high speed by the high-pressure air supplied from the air pipe.

  As shown in FIG. 1 (A), the bell head 4 is formed so as to spread outward in the tip direction, and a hub 43 for diffusing the paint is formed in a place slightly entering from the tip 42. The hub 43 has a plurality of minute holes 43a for discharging the paint in the form of a mist around the hub 43. Further, in the bell head 4, an inner space 45 is formed between the tube fixing portion 44 that fixes the distal end portion 3 a of the rotating body 3 and the hub 43, and the inner space 45 is formed from the inner peripheral surface of the tube fixing portion 44 to the hub. It is formed in the shape of a truncated cone inclined so as to spread toward 43. The peripheral surface of the inner space 45 becomes the inner peripheral surface 41 of the bell head 4.

  As shown in FIGS. 1A and 1C, the housing 5 has an air supply port 7 that supplies only air into the cavity 51 and air that alternately supplies air and thinner into the cavity 51 on the rear end surface 5 a. The thinner supply port 8 is disposed at a position offset from the circle center of the cavity 51. Here, the “offset position” means a shifted position. Further, the housing 5 has a funnel portion 52 that is formed in a conical shape such that the fixing side of the feed tube 2 in the cavity 51 is tapered toward the space 22 of the feed tube 2. Further, a paint supply port 9 that is connected to the inner cylinder 21 and supplies the paint into the inner cylinder 21 is disposed on the rear end surface 5 a.

  The washer 1 is covered with a cover (not shown) except for the tip of the bell head 4.

  In the washing machine 1 configured in this manner, the housing 5 is disposed at a position where the air supply port 7 and the air thinner supply port 8 are offset from the circle center of the cavity 51 on the rear end surface 5a. Since air can always be supplied from the air supply port 7 at the time of cleaning, air can be supplied at the same time when the thinner is supplied from the air thinner supply port 8. Since the fixed side of the feed tube 2 has a funnel portion 52 that tapers toward the space 22 formed between the inner cylinder 21 and the outer cylinder 23 of the feed tube 2, FIG. ), The air AI and the thinner TH are supplied into the cavity 51, so that a vortex is generated along the inclined surface of the funnel portion 52. Therefore, the air AI and the thinner T supplied at the same time are generated. Turning helically in the space 22 of the feed tube 2 in a state that was stirred. In FIGS. 2A and 2B, air AI is indicated by a thick broken line, and thinner TH is indicated by a thin broken line.

  As described above, the air 6 and the thinner 7 supplied at the same time are spirally swirled in the space 22 of the feed tube 2 in a state where the air 6 and the thinner 7 are agitated, so 31 and the inclined surface (inner peripheral surface) of the inner space 45 of the bell head 4 can be bubble-washed with air AI and thinner TH. Specifically, the air AI and the thinner TH stirred from the space 22 of the feed tube 2 rotate along the inclined groove 24 of the outer cylinder 23 at high speed, and the inner peripheral surfaces of the rotating body 3 and the bell head 4. Since the air 31 and the thinner TH are discharged to the slopes of the inner space 45 and the inner space 45, each surface can be uniformly bubble-washed. Moreover, since air AI is always discharged from the inclined groove 24 of the outer cylinder 23 to the slope of the inner space 45 of the bell head 4 together with the inner peripheral surface 31 of the rotating body 3, an air curtain can be built there. . Therefore, it is possible to prevent the thinner TH from being reflected by the hub 43 of the bell head 4 and flowing back between the rotating body 120 and the outer tube 112 of the feed tube 110 due to the discharge pressure of the thinner TH.

  In the conventional coating machine 100 (see FIG. 3A), air and thinner may be simultaneously supplied from the air thinner supply port 160, but the change valve 500 is provided in one cleaning supply pipe 400. Since air and thinner are supplied at the same time, if air and thinner are supplied simultaneously to this single cleaning supply pipe 400, the air pressure is higher, so the air flows backward to the thinner side which is the low pressure side. Will end up.

  In such a coating machine 1, the paint is supplied at a predetermined pressure into the inner cylinder 21 of the feed tube 2 during coating, and the paint is supplied from the tip of the inner cylinder 21 into the inner space 45 of the bell head 4. Discharged with pressure. The bell head 4 from which the paint is discharged into the inner space 45 at a predetermined pressure is rotated at high speed by the air motor through the rotating body 3, so that the paint is blown from the plurality of holes 43 a of the hub 4 by centrifugal force. And sprayed forward in the atomized state.

  Further, at the time of cleaning, the coating machine 1 supplies air and thinner at a predetermined pressure into the cavity 51 of the housing 5 with the bell head 4 facing downward. The mixture is stirred while being swirled in a spiral vortex and is guided into the space 22 of the feed tube 2. In the space 22 of the feed tube 2, the spiral vortex is maintained and guided to the tip 23 d of the outer cylinder 23, and a predetermined amount is introduced into the inner space 45 of the bell head 4 from the inclined groove 24 together with the inner peripheral surface 31 of the rotating body 3. Discharged with pressure. The bell head 4 in which air and thinner are discharged into the inner space 45 at a predetermined pressure is rotated at a high speed by an air motor through the rotating body 3, so that the air and thinner are moved to the inner space 45 and the hub 43 by centrifugal force. Since it is blown off, the paint adhering between the rotating body 3 and the outer tube 23 of the feed tube 2 can be removed together with the inner peripheral surface 31 of the rotating body 3, the inner space 45 of the bell head 4 and the hub 4.

  Further, since the coating machine 1 performs the cleaning with the bell head 4 facing downward, the thinner flows into the space 22 of the feed tube 2 along the inclined surface of the funnel 52 in the cavity 51 of the housing 5. Thus, unlike the conventional coating machine 100 (see FIG. 3C), the thinner does not remain in the cavity 141 of the housing 140.

  The space 22 formed between the inner cylinder 21 and the outer cylinder 23 of the feed tube 2 includes the air supplied from the air supply port 7 through the cavity 51 of the housing 5 and the cavity 51 from the air thinner supply port 8. It is good to form in the gap | interval which raises the flow velocity with the air and the thinner which were supplied alternately via. With such a gap, since the discharge pressure of air and thinner by bubbling cleaning can be increased, cleaning performance can be improved. Therefore, the amount of thinner used and the cleaning time can be shortened.

  Further, the axis of the feed tube 2 is fed to a position opposite to the offset positions of the air supply port 7 and the air thinner supply port 8 around the apex of the cone forming the funnel portion 52 of the cavity 51 of the housing 5. It is preferable that the tube 2 is arranged offset by the diameter of the tube 2. By arranging the feed tube 2 in the housing 5 in this way, the air and thinner swirling in a spiral shape are efficiently and smoothly guided into the space 22 of the feed tube 2 along the inclination of the funnel portion 52 of the housing 5. be able to.

  Although the present invention has been described with the specific embodiments shown in the drawings, the present invention is not limited to the embodiments shown in the drawings, and is known so far as long as the effects of the present invention are achieved. It goes without saying that any configuration can be adopted.

BRIEF DESCRIPTION OF THE DRAWINGS It is a figure which shows the example of preferable embodiment in the coating machine to which the washing | cleaning mechanism of this invention was applied, (A) is whole sectional drawing, (B) is a side view of a housing, (C) is a top view of the front-end | tip of a feed tube. It is. It is a figure which shows the flow state of the air and the thinner in the coating machine to which the washing | cleaning mechanism of this invention was applied, (A) is sectional drawing by the side of a bell head, (B) is sectional drawing by the side of a housing. It is a figure which shows the conventional coating machine, (A) is a block diagram by a cross section, (B) is explanatory drawing which shows a coating state, (C) is explanatory drawing which shows a washing | cleaning state.

Explanation of symbols

1 …… Coating machine 2 …… Feed tube 2A …… Tip area 21 …… Inner cylinder 21a …… Tip 22 …… Space 23 …… Outer cylinder 23a …… Tip opening 23b …… Inner peripheral surface 23c …… Rear End portion 24 …… Inclined groove 3 …… Hollow rotating body 3a …… Tip portion 31 …… Inner peripheral surface 4 …… Bell head 41 …… Inner peripheral surface 5 …… Housing 5a …… Rear end surface 51 …… Cavity 52… ... Funnel part 7 ... Air supply port 8 ... Air thinner supply port

Claims (3)

A double tube type feed tube composed of an inner cylinder to which paint is supplied and an outer cylinder inserted so that the inner cylinder has a space;
A hollow rotating body that is fitted so as to cover the tip end region of the feed tube and rotates around the tip end region by an air motor,
A bell head that is fixed to the tip of the rotating body and sprays the paint discharged from the tip of the inner cylinder by centrifugal force due to the rotation of the rotating body;
The inner cylinder is fixed to a rear end portion of the outer cylinder, and a cylindrical cavity for supplying air and thinner to the space in the feed tube is formed. The cavity is formed in the inner cylinder. A cleaning mechanism for cleaning the rotating body of the cleaning machine and the bell head with the air and the thinner.
The housing has an air supply port for supplying only the air into the cavity and an air thinner supply port for alternately supplying the air and the thinner into the cavity at the rear end surface thereof is offset from the circle center of the cavity. The funnel portion formed in a conical shape that tapers toward the space is provided on the fixed side of the feed tube in the cavity.
The outer cylinder is provided with at least one inclined groove radially cut from the inner peripheral surface toward the outer periphery in the outer peripheral direction, and the front end is discharged along the inclined groove. A cleaning mechanism for a coating machine, wherein the air and the thinner are disposed at positions where the air and the thinner are guided to an inner peripheral surface of the bell head along an inner peripheral surface of the rotating body.   The space formed between the inner cylinder and the outer cylinder of the feed tube alternates between the air supplied from the air supply port via the cavity and the air thinner supply port via the cavity. The cleaning mechanism for a coating machine according to claim 1, wherein the cleaning mechanism is formed with a gap that increases a flow rate between the air and the thinner.   The feed tube has an axial center at a position opposite to the offset position of the air supply port and the air thinner supply port, with the apex of the cone forming the funnel portion of the cavity as the center. 2. The cleaning mechanism for a coating machine according to claim 1, wherein the cleaning mechanism is disposed offset by an amount corresponding to the amount.

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